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• How to use ffmpeg to transcode many live streamed videos ? [closed]

  21 septembre 2020, par user14258924

  PREMISE

  


  As a pet project, I am writing a live video streaming service, in Go, that can consume video streams from OBS via SRT(TS -> h264/aac) and RTMP(FLV -> h264/aac) protocols and am planning to support streaming video from web browser as well, captured from a web camera via JS. This ingress server will receive many video streams in various containers and codecs and I need to normalize them into single container and codec and then create multiple versions for various bitrates(ie. 240p, 360p, 480p, 720p, 1080p...) to pass along where needed in the application. Each stream is split into 2 second GOP segments, separate for audio and video track, that will produce fragmented MP4 as the end result - which can be consumed by web browser.

  


  The issue is that I am using Go which has no libraries for transcoding video so I need to use either ffmpeg or vlc, which is a C code. I have decided to avoid the CGo route and use ffmpeg/vlc as standalone binaries.

  


  QUESTION

  


  My question is how to use either of these project in the most efficient way - avoiding the use of files in favour of unix sockets/streams and also the performance aspect - handling hundreds of video segments in any one time and in sufficient time to avoid creating too much of a lag beteen producer and consumer.

  


  So let's say I will pick the most used one - ffmpeg, how should I actually use it to achieve what I have described ? How would you set it up and which flags/config to use with it ?

  


  Can the performance be even achieved or is it just too much and I will need some sort of ffmpeg cluser to even come close to some useful performance/low delay ?

  


• avcodec/mediacodecdec : add workaround for buggy amlogic mpeg2 decoder

  26 avril 2018, par Aman Gupta

  avcodec/mediacodecdec : add workaround for buggy amlogic mpeg2 decoder
  I tested the previous mediacodec changes on seven different Android
  
  TV devices, with both mpeg2 and h264 content. All except one worked
  
  as expected. The exception was the MiBox3 running Android 6.0.1,
  
  where playback would freeze on a frame every few seconds. I tested
  
  two other AMLogic devices with newer Android versions that did not
  
  show the same problem. H264 decoding on the MiBox3 was also not affected,
  
  so this workaround applies only to OMX.amlogic.mpeg2.decoder.awesome
  
  on Android API22.
  There is a rumor that Xiaomi is planning to release Android Oreo for
  
  the MiBox3, so I will revisit in a few months to confirm whether this
  
  is specific to os/driver version or the chipset used in that device.
  Signed-off-by : Aman Gupta <aman@tmm1.net>
  
  Signed-off-by : Matthieu Bouron <matthieu.bouron@gmail.com>
  

  • [DH] libavcodec/mediacodecdec.c

• Piwik awarded Gold Prize at Open Source Software World Challenge

  22 décembre 2014, par Matthieu Aubry — About

  We are excited to announce that Piwik has been awarded the Gold Prize in the Open Source Software World Challenge 2014 !

  

  Winning this award is a testament to the positive impacts of the Piwik platform worldwide. Every day dozens of new people are embracing Piwik to power their web and mobile analytics which gives them full control over their data.

  Every member of the Piwik community, from core developer to beginning user, should be proud to be part of this momentum : congratulations to us all !

  The Open Source World Challenge is the annual competition hosted by the Ministry of Science, ICT and Future Planning of Korea. This competition is mainly intended to promote open source software and expand various exchanges among open source software developers worldwide.

  

  Piwik Awards